I'm sorry your family is not respecting you.
like was said-- think about if YOU would do a certain thing to someone else and if the answer is NO-- then tell that person you can't at this time.
I mentioned to you before the book-- "Will I Ever Be Good Enough? Healing the daughters of Narcissistic Mothers"(by Dr. Karyl McBride)..... in that book it says that many such daughters put up with a whole lot more than the average person would in being used/abused and or disrespected. (they learned from mother and now know how to allow others to act similar with the illusion that that's what will make them lovable)
It's so sad that we continue the cycle towards ourselves that our mother's started

maybe if you think of it as- breaking an abusive family cycle... then saying No wouldn't be as hard??
thinking of you
fins